1132 results about "Discrete points" patented technology

There is provided an optical element for an illumination system for wavelengths of ≦193 nm. The illumination sytem includes a light source, a field plane, an exit pupil, and a plurality of facets. The plurality of facets receives light from the light source and guides the light to a plurality of discrete points in the field plane. The plurality of discrete points collectively illuminate a field in the field plane, and each of the plurality of facets illuminates a region of the exit pupil.

A device and method for forming a tubular braid comprising a plurality of filaments. The braiding machine comprises a disc with a mandrel extending from the center in a perpendicular direction and a plurality of catch mechanisms arranged circumferentially around the edge of the disc. A plurality of filaments are temporarily affixed to the mandrel, each filament extending from the mandrel toward the edge of the disc and engaging the edge of the disc at a discrete point of engagement The plurality of catch mechanisms are attached to actuators adapted to move the catch mechanisms in a generally radial direction relative to the edge of the disc to allow the catch mechanism to engage a subset of the filaments and move the engaged filaments beyond the circumferential edge of the disc.

A computer implemented method, apparatus, and computer program product code for temporal, event-based video fingerprinting. In one embodiment, events in video content are detected. The video content comprises a plurality of video frames. An event represents discrete points of interest in the video content. A set of temporal, event-based segments are generated using the events. Each temporal, event-based segment is a segment of the video content covering a set of events. A time series signal is derived from each temporal, event-based segment using temporal tracking of content-based features of a set of frames associated with the each temporal, event-based segment. A temporal segment based fingerprint is extracted based on the time series signal for the each temporal, event-based segment to form a set of temporal segment based fingerprints associated with the video content.

A video Keratometer / Pachymeter comprising an array of illuminated points disposed in concentric circles around the optical axis of a television camera for definition of corneal surface contour by a method similar to the well know Placido, except that the isolated point ring format provides unambiguous back ray trace information to eliminate errors inherent in the prior art, in combination with a projected pattern of discrete points to elicit Tyndall images for definition of both anterior and posterior corneal surface by triangulation using multiple television cameras viewing the reflected and Tyndall images, substraction of a view of the eye with neither pattern superimposed as well as each pattern in sequence for isolation of the data containing points from the general clutter of background pictorial information.

The invention discloses a method for projection-type laser etching on a free curved surface. By combining a laser galvanometer as well as a triaxial coordinate positioning technology and adopting the principles of partitioned parallel projection as well as height mapping, the invention directly conducts precise surface laser etching on the basis of a discrete point cloud model of a free curved surface part. The method has the characteristic that the laser etching properties such as the shape and size of a spot and the energy distribution remain unchanged within the focal depth range of a focusing lens, so that the free curved surface is converted into a plurality of plane subblocks for processing, and the high-precision processing efficiency of the free curved surface can be improved even by adopting the existing laser etching technology. The diameter of the focusing spot of a laser beam can reach tens of microns and is much smaller than the size of the part processed by a traditional knife tool; and the processing precision of nearly 10 microns can be realized by controlling the laser energy property. Under the premise of meeting the demands for high precision and high efficiency of pattern etching on the free curved surface, the method can realize high reliability and high flexibility in the processing of the free curved surface.

A control system for a wind turbine comprises: a sensor arrangement for capturing measures related to the turbine operation and fatigue accumulation; an upper level controller, which, on the basis of a statistical treatment of said measures, calculates optimized control settings at discrete points of time; a measurement module which processes said measures into instantaneous values; and a lower level controller that receives said control settings and said instantaneous values and calculates instantaneous optimal commands to control turbine actuators. The lower level controller comprises a continuous-time damage model which calculates the rate at which damage is accumulated at any time, and an optimal controller which controls operational states of the turbine, either by directly giving feedback of the instantaneous values to the actuators, or by generating a turbine performance objective function which is continuously optimized by repeatedly solving a receding horizon optimization problem.

The embodiment of the invention discloses a method and device for detecting an abnormal point in a time sequence. The method comprises the following steps: acquiring a discrete point in a business index time sequence; carrying out clustering prediction on a time subsequence comprising the discrete point, and determining a first prediction result of the discrete point; obtaining an error value from an index value of the discrete point through decomposition according to the time sequence decomposition method, and determining a second prediction result of the discrete point according to the error value; and determining an anomaly detection result of the discrete point according to the first prediction result and the second prediction result. The method and device adopting the technical scheme has the advantages that the abnormal point identification accuracy can be improved; and compared with the baseline detection mode in the prior art, the method and device achieves a much lower occurrence rate of abnormal point false alarms.

The present invention relates to a space form detection device of fine-long flexible bar and its detection method. Said device is composed of fine-long flexible bar, fiber-optic grating sensor array, fiber-optic grating modulator-demodulator, local area network router, data acquisition and data processing module and display equipment. The space form detection method of fine-long flexible bar includes the following steps: utilizing a group of grating array formed from four optical fibers arranged on the fine-long flexible bar, utilizing scale factor between the off-line labeled curvature and wavelength and utilizing fiber-optic grating modulator and demodulator to measure wavelengths of 20 raster points in five discrete points of fine-long flexible bar in the space so as to obtain the space curvature size and direction of discrete point position, then utilizing data processing module to reconstruct the form of said fine-long flexible bar in space. Said device can be used for making real-time tracking detection of human body cavity channel and fine-small vessel forms in the therapeutic process.

A light source is provided to illuminate a cable connecting a video game controller to a game console. A low power consuming LED in light communication with a side glowing fiber optic cable may be employed and integrated into the communication bundle extending between the controller and console. Alternately LED lights may be disposed at discrete points along the cable. A shield may also be disposed between the light cable and communication bundle to inhibit interference. The entire bundle is preferably wrapped in a clear or translucent material to allow light to emanate from the cable.

The present invention provides an intersection condition-orientated unmanned vehicle trajectory planning method based on the Bezier curve and the VFH algorithm. The method includes the following steps that: 1) the starting point pose P0 (x0,y0,theta0) and destination point pose P3 (x3,y3,theta3) of current trajectory planning are acquired; 2) a trajectory cluster A1 from the starting point pose P0 (x0,y0,theta0) to the destination point pose P3 (x3,y3,theta3) is generated through adopting a three-order Bezier curve model; 3) the trajectory cluster A1 is screened according to a maximum curvature constraint, so that a trajectory cluster A2 is obtained, collision detection is performed on A2, so that a collision-free trajectory cluster A3 is obtained; 4) if A3 is not empty, an optimal trajectory is selected from A3 according to a trajectory smoothest principle and is outputted to a control layer, and the method is terminated, otherwise, the method shifts to step 5; 5) a movement region in the original VFH algorithm is improved, so that a fan-shaped movement region is built; 6) obstacle information is utilized to establish a grid map; 7) the fan-shaped movement region is divided into a plurality of fan-shaped regions, and whether an obstacle exists is judged; 8) the Bezier curve is used in combination, and optimal trajectory points are selected; and 9) with a discrete point set generated in the step 8 adopted as control points, a B-spline curve is generated, and the B-spline curve is adopted as the final trajectory of an unmanned vehicle.

Disclosed is a method for automatically optimizing point cloud data quality, including the following steps of: acquiring initial point cloud data for a target to be reconstructed, to obtain an initial discrete point cloud; performing preliminary data cleaning on the obtained initial discrete point cloud to obtain a Locally Optimal Projection operator (LOP) sampling model; obtaining a Possion reconstruction point cloud model by using a Possion surface reconstruction method on the obtained initial discrete point cloud; performing iterative closest point algorithm registration on the obtained Possion reconstruction point cloud model and the obtained initial discrete point cloud; and for each point on a currently registered model, calculating a weight of a surrounding point within a certain radius distance region of a position corresponding to the point for the point on the obtained LOP sampling model, and comparing the weight with a threshold, to determine whether a region where the point is located requires repeated scanning. Further disclosed is a system for automatically optimizing point cloud data quality.

The invention discloses a complex space surface on-machine quality test system, comprising a processing center, three coordinate probes and a measuring signal receiver. The processing center is used to process parts and is equipped with an open numerical control system. The probes are controlled by the numerical control system of a numerically controlled machine tool, and are used to obtain the geometrical measurement value of the discrete points on the surface of the workpiece which has been processed. The measuring signal receiver is used to receive the infrared signals sent by the probes, and transmits the signals to the numerical control system. The numerical control system transmits the measurement value signals to the computer of the user through a communication system, and controls the main shaft of the numerically controlled machine tool to stop moving at the same time. The computer of the user which is provided with a measurement control and error evaluation module is used to exchange data with the numerical control system through the communication system, and evaluates the error and gives an evaluation result based on the ideal value and measurement value of measuring points through the measurement control and error evaluation module. The complex space surface on-machine quality test system can inspect the quality of the workpiece at any moment during processing, guarantees the processing precision of the workpiece, and saves time.

Disclosed is an optical fiber cable that includes optical fibers and a deformable coupling element enclosed within a buffer tube. The coupling element is formed from a deformable yet substantially incompressible material and features a number of raised members projecting toward the optical fibers. The design of the coupling element layer permits coupling of the optical fibers to the buffer tube without the use of a compressive cushioning layer. This arrangement distributes the compressive force applied to discrete points along the outer perimeter of the optical fiber element.

As control points in haptic systems move around, the phase offsets for each transducer change at discrete points in time. These are each expressed as a phase offset combined with a monochromatic carrier frequency. To prevent sharp frequency changes, an algorithm that maintains smooth transitions is used. Further, non-idealities in the implementation of haptic array modulation can create spurs in the frequency response of audio output from the array. Adjusting the signal carrier frequency and the signal modulating frequency may substantially reduce audio noise via a notch filter centered at an interpolation frequency.

The invention relates to a method for cutter-axis vector fairing of complex curved surface five-axis numerical control machining based on kinematical constraints, which belongs to the field of precise and efficient processing of complex curved surface five-axis numerical control machining, and particularly relates to a method for cutter-axis vector fairing based on machine tool kinematical constraints in the process of complex curved surface five-axis numerical control machining. The method is characterized by establishing a machining tool swivel feeding shaft angle optimized mathematical model on the basis of determining a cutter-axis fairing adjustment interval on a processing track curve and determining a discrete point according to the cutter step length, carrying out optimization on the corresponding machining tool swivel feeding shaft angle of the discrete point, and determining a corresponding coordination calculation method of a cutter-axis vector; then calculating the rotation angle of the cutter-axis vector opposite to the curved surface normal vector corresponding to the discrete point; and finally, carrying out fitting on the acquired discrete processing track normal vector angle, thereby acquiring a cutter-axis vector function for fairing, and ensuring a rotation axis of a machine tool to be smooth in motion. The method provided by the invention realizes smooth motion of the rotation axis of a five-axis numerical control machine tool, is wide in application range, and effectively improves the processing quality of the complex curved surface.

A pipe network node flow measuring and dispatching method based on pressure monitoring comprises the steps that node pressure of a predetermined node in a pipe network is measured actually, and according to the measured node pressure, based on the discrete point spatial interpolation computing method, node water heads of all nodes are worked out; the pipe section flow of a predetermined pipe section is measured actually, coefficients of friction resistance of all flow measuring pipe sections are determined according to the actually measured pipe section flow and the worked-out node water heads, pipelines are grouped through the spatial clustering algorithm according to the coefficients of friction resistance of the pipe sections, and coefficients of friction resistance of all pipe sections are determined; according to the worked-out node water heads, the coefficients of friction resistance of the pipe sections, pipe lengths and pipe diameters, the pipe section flows of all the pipe sections are worked out; according to the material equilibrium principle, the node flows of all the nodes are worked out, and therefore pipe network model updating and checking, pipe network dispatching, leakage quantity analysis, leaking point positioning and other pipeline maintenance and operation management are conducted conveniently. By applying the method, energy consumption and loss due to leakage can be reduced substantially, and the pipeline management level is improved.

The embodiment of the invention discloses an information processing method and device. The method comprises the steps that an HTML document set which is obtained in advance is analyzed, and text data sets contained in the HTML document set are extracted; word segmentation is conducted on the text data sets, and a text segmentation table is obtained; word frequency analysis is conducted on all words in the text segmentation table, and a text vector space matrix is constructed; discrete point text vectors in the text vector space matrix are eliminated, and a text similarity matrix of all text vectors in the text vector space matrix without the discrete point text vectors is obtained; according to the text similarity matrix, topic cluster is conducted on the text data set. By means of the method, a word list can be accurately constructed, topic cluster is conducted after the discrete point text vectors are eliminated, the topic cluster speed is increased, and the topic cluster accuracy is improved.

The invention relates to an open area target detection and tracking method based on binocular vision sparse point matching. The open area target detection and tracking method based on the binocular vision sparse point matching comprises the following steps. Calibration of video cameras is achieved by utilizing a Zhang checkerboard calibration method, and a transformational relation between a video camera coordinate system and a user-defined world coordinate system is established. Afterwards, related algorithm of the method is executed, wherein synchronous images of two video cameras are input. The images are first corrected to an extreme line parallel state, and then sparse characteristic point matching is achieved by utilizing extreme line constraint. Matching points are mapped to the world coordinate system and projected to a ground plane. Discrete point clustering is achieved by means of human body type information and a golden section ratio. Finally, robust detection and tracking of pedestrian targets in a monitoring area are achieved with the clustering as a unit and by combining joint probability data association and target color information. According to the open area target detection and tracking method based on the binocular vision sparse point matching, the operating amount is enabled to become small, and the target detection and the tracking are enabled to be accurate.

A method for controlling a height of a cutting torch, includes loading a workpiece onto a numerical control machine, scanning the workpiece with a scanning device at a plurality of discrete points on an upper surface of the workpiece, measuring an X-, a Y-, and a Z-coordinate for each respective one of the scanned discrete points, where X and Y define a plane substantially parallel to the loaded workpiece and Z represents a distance between the upper surface and the scanning device at a respective discrete point, storing the measured XYZ coordinates from each of the scanned discrete points into a data set, mathematically fitting the stored data set to a smooth surface representative of the upper surface of the loaded workpiece, and cutting the workpiece along a cutting path programmed into the numerical control machine, while controlling the cutting torch height to correspond to the representative smooth surface.

An improved system and method for providing emergency lighting and directional exit indication in the event of power outage and / or smoke / fire events. The system provides a lighted pathway consisting of discrete points of light, some of which strobe or trace toward the exits and others of which burn steadily for general area emergency lighting. The method consists of detecting the emergency condition and illuminating the appropriate emergency lighting.

The invention discloses a method for automatically extracting road information in a vehicle-mounted laser scanning point cloud. The method for automatically extracting the road information in the vehicle-mounted laser scanning point cloud comprises the steps that all scanning lines are extracted from the discrete point cloud according to the information, such as the traveling track, the laser point scanning angle and the scanning time, which is recorded by a vehicle-mounted system, and a half scanning line index suitable for data processing is established; the spatial relation between two adjacent points is analyzed, laser point generation clustering is conducted, and dynamic window point sets which can describe the type characteristics of certain types of ground objects are generated; the main geometrical characteristic factors, comprising elevation difference factors and horizontal projection distance factors, of the different ground object window point sets are analyzed; window starting point types are judged according to the main geometrical characteristic factors of the window point sets, movement type dynamic window classification is conducted from a central angle point to the two sides according to the half scanning line index until a non-road-surface point is found; clustering and denoising are conducted on roadside points according to the distribution relation of bottom points of roadside stones and by the adoption of the principle of consistency between the scanning angle and the distance.

The invention provides a face detection method based on a Gaussian model and a minimum mean-square deviation, and relates to a face recognition technology. A face detection method based on the Gaussian model and the minimum mean-square deviation under the premise of a complicated background, a side face, a stopper and a plurality of faces. The method comprises the following steps of: building a YCbCr Gaussian model: building the YCbCr Gaussian model for face skin color distribution according to collected skin color sample data, and performing lighting compensation on the image, wherein in the YCbCr, Y is a brightness component, Cb is a blue chroma component, and Cr is a red chroma; performing skin color segmentation on the image by using the built YCbCr Gaussian model and the minimum mean-square deviation; performing binaryzation on a skin color region, and processing a binary image by opening to eliminate a small bridge and discrete points; rejecting detected non-face regions in the similar skin color or skin color according to future knowledge of a face; and finally marking a face position by using a rectangular frame.

The invention provides a method for planning a path in an urban road traffic network. The method comprises the steps of dividing a region to be searched, which is determined according to a start point and a final point, into multiple sub regions according to a given road network density; then mapping the multiple sub regions into one-dimensional discrete points, and forming a Voronoi graph based on the discrete points; determining an adjacency relation between every two of all the sub regions according to the Voronoi graph, and judging the connectivity between every two adjacent sub regions; constructing a new road network according to a set of the selected adjacent sub regions which are communicated, and searching an optimal path between the start point and the final point in the new constructed road network. According to the method, the construction time of a road network topological structure is shortened; furthermore, the search range of the path is narrowed, the search time is shortened and the search efficiency is improved.

The invention relates to a wind field visual display method based on a three-dimensional virtual globe. The wind field visual display method comprises the following steps of (1) automatic meteorological station data access, wherein automatic meteorological station data provided by the weather bureau serve as a data source of wind field data at a server side, and the automatic meteorological station data are imported at regular times in the data form meeting the NetCDF standard; (2) gridding of the wind field data, wherein the acquired automatic meteorological station data serve as discrete point data, and the server side conducts interpolation on the automatic meteorological station discrete point data according to a visual area covered with the wind field; (3) user interactive response, wherein a client side downloads the wind field grid data at specified time and in specified space from the server side according to user interactive operation; (4) wind filed visualization, wherein the client side drives a particle system according to the downloaded wind field grid data, and wind field visualization is achieved by controlling movement of the particles in three-dimensional space. The wind field visual display method based on the three-dimensional virtual globe is good in display effect, efficient to operate and high in instantaneity.

A moving system comprising a master controller for monitoring and controlling a master operation comprising one or more individual movers such that each mover arrives at predefined end point at selected times. Each mover includes a mover control system that interacts with the master controller and has a predefined virtual vector path with one or more defined end points. The predefined virtual vector path comprises a plurality of discrete points, wherein each discrete point has a vector axis for use by the master controller and the mover control system to direct the mover to move such that it arrives at each defined end point at a selected time. In operation, the master controller functions to modify the predefined virtual path and sends commands to the mover control system in response to changes in the master operations.